I used partition magic and it wouldnt load. So I took out the 120 and tried with just the 20 and it wouldn't load. Finally I downloaded the fedora core 6 live cd and it wouldn't boot either. It would start to boot then the pc would restart.

Not obvious why you'd get the reboots. That's odd. All I can suggest is that you try "linux i686" from the FC6 first install screen. Also try the text based install, but the FX5900XT isn't that exotic.

OK - you did a great job finding the problem.
I'd suggest tho' that you'll may want to boot kernels with the "apic=off" option on the kernel command line.

*AFTER* you install FC6 you may need to reboot the CD in rescue mode and edit the file in /boot/grub/grub.config so that "apic=off" appears on the ends of the kernel lines like:
kernel /boot/vmlinuz-2.6.18-1.2200.fc5 ro root=/dev/hda4 rhgb quiet acpi=off

I have a setting in my mobo bios that allows me to enable or disable the acpi. But it wasn't acpi that was causing the problem it was the IO APIC Support that was causing the problem and after I disabled that everything runs fine.

well I guess I could rob a gig from wifes puter lol wonder if she would notice I do have 3 memory slots. Maybe I'll just tell her that stick was compatible with her system. lol or maybe that my other 2 sticks were lonely.